CN106471859B - Wireless communication device and wireless communication method - Google Patents

Wireless communication device and wireless communication method Download PDF

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Publication number
CN106471859B
CN106471859B CN201580036171.2A CN201580036171A CN106471859B CN 106471859 B CN106471859 B CN 106471859B CN 201580036171 A CN201580036171 A CN 201580036171A CN 106471859 B CN106471859 B CN 106471859B
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wireless communication
communication device
role
communication apparatus
connection
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CN106471859A (en
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寺崎努
高桥智洋
奥村亮
富田高弘
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Casio Computer Co Ltd
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Casio Computer Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q30/00—Commerce
    • G06Q30/02—Marketing; Price estimation or determination; Fundraising
    • G06Q30/0241—Advertisements
    • G06Q30/0251—Targeted advertisements
    • G06Q30/0267—Wireless devices
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q30/00—Commerce
    • G06Q30/02—Marketing; Price estimation or determination; Fundraising
    • G06Q30/0241—Advertisements
    • G06Q30/0251—Targeted advertisements
    • G06Q30/0269—Targeted advertisements based on user profile or attribute
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/06—Network architectures or network communication protocols for network security for supporting key management in a packet data network
    • H04L63/061—Network architectures or network communication protocols for network security for supporting key management in a packet data network for key exchange, e.g. in peer-to-peer networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/18—Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data
    • H04W8/245—Transfer of terminal data from a network towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/20—Master-slave selection or change arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/10—Network architectures or network communication protocols for network security for controlling access to devices or network resources
    • H04L63/101—Access control lists [ACL]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/08—Access security
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/40—Security arrangements using identity modules
    • H04W12/47—Security arrangements using identity modules using near field communication [NFC] or radio frequency identification [RFID] modules

Abstract

A wireless communication device (100b) operating as a master transmits a role change request to a wireless communication device (100a) operating as a slave when the role change request is accepted, and disconnects the wireless communication device (100a) after a channel for notification is agreed upon for reconnection. Then, the wireless communication device (100b) transmits an advertisement to the wireless communication device (100a) by using the agreed advertisement channel. The wireless communication device (100a) that has received the notification transmits a connection request to the wireless communication device (100b), and establishes reconnection with the wireless communication device (100 b).

Description

Wireless communication device and wireless communication method
Technical Field
The present invention relates to a wireless communication apparatus and a wireless communication method.
Background
There are techniques for: in a plurality of wireless communication apparatuses that perform wireless communication with each other, each apparatus is set to a predetermined role (responsibility), and performs wireless communication based on the role. For example, japanese patent laid-open publication No. 2013-229805, which is a japanese patent document, discloses a technique of: in the WiGig (Wireless Gigabit) communication, a Wireless communication apparatus set to one of two roles of "STA (Station)" and "PCP (Personal basic service set central point)" determines whether or not its own role needs to be changed when testing the connection with another Wireless communication apparatus, and if it is determined that the change is necessary, the Wireless communication apparatus exchanges the role of the other Wireless communication apparatus with its own role and connects with the other Wireless communication apparatus.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-229805
Disclosure of Invention
Problems to be solved by the invention
In a wireless communication system that performs wireless communication based on Bluetooth low energy (registered trademark), which is an example of a short-range wireless communication standard, a wireless communication device operates in a state where connection is established, based on one of two roles, that is, a master that is responsible for wireless communication and a slave that is responsible for wireless communication under the control of the master. A wireless communication device having many functions, such as a smartphone, may operate as either a master or a slave. Therefore, for example, in order to suppress battery consumption of a wireless communication device operating as a master during communication, a situation arises in which it is desired to change the role to a slave that consumes relatively little power. However, in order to change the role, it is necessary to temporarily disconnect the connection to another wireless communication apparatus. When the connection is disconnected, the same wireless communication apparatus is not always reconnectable, and smooth reconnection after the role change is desired.
The present invention has been made in view of the above problems, and an object thereof is to provide a wireless communication apparatus and a wireless communication method capable of smoothly changing roles.
Means for solving the problems
In order to achieve the above object, a wireless communication device according to claim 1 of the present invention is a wireless communication device that performs wireless communication based on one of a master and a slave,
the wireless communication apparatus includes:
a role change reception unit that receives a request for changing a role from a master to a slave in a state where the role of the wireless communication device is the master and a connection to another wireless communication device that operates as a slave is established; and
and an identification information transmitting unit that transmits identification information to the other wireless communication device using a predetermined channel at a time interval shorter than a predetermined comparison criterion when the character change receiving unit does not receive the change request, when the character change receiving unit receives the change request.
In order to achieve the above object, a wireless communication device according to claim 2 of the present invention is a wireless communication device that performs wireless communication based on one of a master and a slave,
the wireless communication apparatus includes:
a role change reception unit that receives a role change request from the slave to the master in a state where the role of the wireless communication device is the slave and a connection to another wireless communication device that operates as the master is established; and
a reception unit that waits for the identification information transmitted from the other wireless communication device by receiving in a predetermined pattern on a plurality of channels including a predetermined channel when the role change reception unit receives the change request,
the receiving unit receives the plurality of channels in the predetermined pattern as follows: the time or the number of times of waiting for the identification information on the predetermined channel is longer or more than a predetermined comparison criterion when the character change reception unit does not receive the change request.
In order to achieve the above object, a wireless communication device according to claim 3 of the present invention is a wireless communication device that performs wireless communication based on one of a master and a slave,
the wireless communication apparatus includes:
a role change reception unit that receives a request for changing a role from a master to a slave in a state where the role of the wireless communication device is the master and a connection to another wireless communication device that operates as a slave is established;
a connection disconnection unit configured to disconnect the connection to the other wireless communication apparatus when the role change reception unit receives the change request; and
and an identification information transmitting unit that transmits identification information to the other wireless communication apparatus when it is determined that the connection with the wireless communication apparatus is disconnected by the connection disconnecting unit.
In order to achieve the above object, a wireless communication method according to claim 4 of the present invention is a wireless communication method executed by a wireless communication apparatus that performs wireless communication based on one of a master and a slave,
the wireless communication method includes:
a role change reception step of receiving a change request from the master to a role of the slave in a state where the role of the wireless communication device is the master and a connection with another wireless communication device operating as the slave is established; and
an identification information transmission step of transmitting identification information to the other wireless communication device using a predetermined channel at a time interval shorter than a predetermined comparison criterion when the change request is not accepted in the role change acceptance step, when the change request is accepted in the role change acceptance step.
In order to achieve the above object, a wireless communication method according to claim 5 of the present invention is a wireless communication method executed by a wireless communication apparatus that performs wireless communication based on one of a master and a slave,
the wireless communication method includes:
a role change reception step of receiving a role change request from the slave to the master in a state where the role of the wireless communication device is the slave and a connection is established with another wireless communication device that operates as the master; and
a reception step of waiting for the identification information transmitted from the other wireless communication apparatus by receiving in a predetermined pattern on a plurality of channels including a predetermined channel when the role change reception step has received the change request,
in the receiving step, receiving is performed on the plurality of channels in the predetermined pattern as follows: the time or the number of times of waiting for the identification information on the predetermined channel is longer or more than a predetermined comparison criterion when the character change reception step does not receive the change request.
ADVANTAGEOUS EFFECTS OF INVENTION
The present invention can provide a wireless communication apparatus and a wireless communication method capable of smoothly changing roles.
Drawings
Fig. 1 is a diagram showing an example of the configuration of a wireless communication system according to embodiment 1.
Fig. 2 is a schematic block diagram showing a configuration example of a wireless communication device according to embodiment 1.
Fig. 3 is a schematic block diagram showing an example of a functional configuration of a control unit of the wireless communication device according to embodiment 1.
Fig. 4A is a diagram showing the time transition of the scanning operation and the notification operation in embodiment 1.
Fig. 4B is a diagram showing a time transition of a conventional scanning operation and a notification operation.
Fig. 5 is a sequence diagram showing an example of the operation of the wireless communication system according to embodiment 1.
Fig. 6 is a flowchart showing an example of the role change process (a) executed by the wireless communication apparatus according to embodiment 1.
Fig. 7 is a flowchart showing an example of the role change process (b) executed by the wireless communication apparatus according to embodiment 1.
Fig. 8 is a diagram showing the time transition of the scanning operation and the notification operation in embodiment 2.
Fig. 9 is a diagram showing the time transition of the scanning operation and the notification operation in embodiment 3.
Fig. 10 is a diagram showing the time transition of the scanning operation and the notification operation in embodiment 4.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings.
(embodiment mode 1)
Fig. 1 is a diagram showing an example of a configuration of a wireless communication system 1 according to embodiment 1 of the present invention.
In the configuration example shown in fig. 1, the radio communication system 1 is configured by two radio communication apparatuses 100(100a and 100 b). The wireless communication devices 100 perform wireless communication with each other based on Bluetooth (registered trademark) Low Energy (hereinafter referred to as BLE). BLE is a standard (pattern) established for the purpose of low power consumption under a short-range wireless communication standard called Bluetooth (registered trademark). The wireless communication apparatus 100 operates based on the role (role) of the master or the slave when performing wireless communication with another wireless communication apparatus 100. For example, the wireless communication apparatus 100 operating as a master uses a service (for example, measured data) provided from the wireless communication apparatus 100 operating as a slave. In addition, for example, the wireless communication apparatus 100 operating as a slave provides a service (for example, measured data or the like) to the wireless communication apparatus 100 operating as a master.
The wireless communication device 100 is a device such as a mobile phone, a smartphone, a tablet personal computer, or a notebook personal computer, and is a terminal having a wireless communication function by BLE. When the wireless communication device 100 functions as a master, various data are received from the wireless communication device 100 functioning as a slave, and based on the received data, various information is displayed on a display unit 107 described later, or a sound such as an alarm is sounded from a speaker 106 described later. When the wireless communication device 100 functions as a slave, it notifies the wireless communication device 100 functioning as a master of the service profile held by itself, or transmits a notification for waiting for a connection request from the master.
Next, a hardware configuration and the like of the wireless communication system 1 according to embodiment 1 will be described.
Fig. 2 is a block diagram schematically showing an example of the hardware configuration of the radio communication apparatus 100 according to embodiment 1. As shown in fig. 2, the wireless communication apparatus 100 includes a control unit 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, a wireless communication processing unit 104, an antenna 105, a speaker 106, a display unit 107, and an operation unit 108.
The control Unit 101 is constituted by, for example, a CPU (Central Processing Unit). The control unit 101 executes software processing in accordance with a program (for example, a program for realizing operations of a character conversion process (a) and a character conversion process (b) shown in fig. 6 and 7 described later) stored in the ROM102, thereby controlling various functions provided in the wireless communication device 100.
The ROM102 is configured by a nonvolatile memory such as a flash memory, and stores programs and data for controlling various functions by the control unit 101 as described above.
The RAM103 is composed of a volatile memory and is used as a work area for temporarily storing data for the control unit 101 to perform various processes.
The wireless communication processing unit 104 is configured using, for example, a Radio Frequency (RF) circuit, a Baseband (BB) circuit, a memory circuit, and the like. The wireless communication processing unit 104 transmits and receives a BLE wireless signal via the antenna 105. The memory circuit of the wireless communication processing unit 104 is used as a region for storing and updating a white list (described in detail later).
The speaker 106 outputs sounds such as an alarm based on the sound data from the control unit 101. The display unit 107 is constituted by, for example, an lcd (liquid Crystal display), an el (electroluminescence) display, a driver, and the like. The display unit 107 displays an image in accordance with the image signal output from the control unit 101.
The operation unit 108 is an interface for accepting operation contents of a user, and is constituted by an input device such as a touch panel, buttons, and a keyboard, for example. The operation unit 108 outputs the received operation content to the control unit 101.
Next, the function of the control unit 101 of the radio communication apparatus 100 will be described. Fig. 3 is a schematic block diagram showing an example of the functional configuration of the control unit 101 of the radio communication apparatus 100. As shown in fig. 3, the control unit 101 functions as a role change reception unit 111, a role change confirmation unit 112, a connection disconnection unit 113, a notification transmission unit 114, a scanning unit 115, a connection confirmation unit 116, and a data communication unit 117. The role change receiving unit 111, the role change confirming unit 112, the connection disconnecting unit 113, the notification transmitting unit 114, the scanning unit 115, the connection establishing unit 116, and the data communication unit 117 may be a single CPU, or may be provided separately for each CPU to perform each operation.
In a state where a connection is established with another wireless communication apparatus 100, the role change reception unit 111 receives a change request for changing a role from a current role to another role of the two roles, i.e., the master and the slave.
For example, the role change reception unit 111 receives a change request based on the situation of the wireless communication apparatus 100 itself. Specifically, for example, when the wireless communication apparatus 100 of the own currently operates as a master and the battery remaining capacity is a little more, the role change reception unit 111 determines that the role change request from the master to the slave is received. As a result of such a role change, the wireless communication apparatus 100 can operate as a slave that consumes less power than the master.
The character change receiving unit 111 may receive a change request from another wireless communication apparatus 100. For example, when a change request for changing a role from a current role to another role is received from another wireless communication apparatus 100 to which connection is established, the role change reception unit 111 determines that the change request is received.
When the role change reception unit 111 receives a change request based on the situation of the wireless communication device 100 of the user, the role change confirmation unit 112 inquires of the other wireless communication device 100 to which connection is established whether or not a role change from the current role to another role is possible. Then, when the other wireless communication apparatus 100 can perform role change, it transmits a request for role change (role change request).
When the role change reception unit 111 receives a change request from another wireless communication apparatus 100 to which connection has been established, the role change confirmation unit 112 responds to the other wireless communication apparatus 100 whether or not the wireless communication apparatus 100 itself can perform a role change. When the role change request is received from the other wireless communication apparatus 100, a response to the role change request is transmitted to the other wireless communication apparatus 100. The response to the character change request from the character change confirmation unit 112 includes, as parameters, whether or not the character change is possible, and if the character change is possible, information on the notification channel (described in detail later) after the connection is disconnected.
In addition, for example, a bit indicating whether or not a role change is possible can be newly defined in a reservation bit (japanese: ビット) (RFU: Reserved for Future Use) prepared for a Feature Set of a link layer (role switch). Therefore, the wireless communication device 100 that has received the inquiry as to whether the character change is possible may check the bit indicating whether the character change is possible defined in the RFU and include information on the bit in the response to the inquiry.
The role change confirmation unit 112 registers the wireless communication apparatus 100, which is currently connected as a communication partner, in the white list set in the link layer. In addition, the read-out of the white list is not defined by the current HCI (Host control interface) command, and thus a new definition is required. Instead of newly defining the command, the host may also hold information to be added to the existing white-listed devices. In this way, the active white list is backed up on the host side, and both the wireless communication apparatuses 100 that perform role switching use the white list in which only the wireless communication apparatus 100 that is the role switching partner is set, and perform notification or scanning, thereby making it possible to always reconnect to the role switching partner. In addition, even when reconnection is completed or when reconnection fails, the information of the white list changed for reconnection can be restored based on the information backed up on the host side.
When the role change confirming unit 112 confirms the role change with the other wireless communication apparatus 100 to which the connection is established, the connection disconnecting unit 113 disconnects the connection.
When the role change confirmation unit 112 determines the role change from the master to the slave, the notification transmission unit 114 transmits a notification using one notification channel set in the role change confirmation unit 112.
Here, the notification in wireless communication based on BLE will be described. In wireless communication based on BLE, before connection is established, one wireless communication apparatus 100 (advertisement originator) transmits an advertisement, and the other wireless communication apparatus 100 (scanning device) receives the advertisement by scanning. The notification (japanese patent No. アドバタイズ) is a packet containing identification information for notifying the other wireless communication apparatus of its presence in order to search for the other wireless communication apparatus or connect to the other wireless communication apparatus, or an operation of transmitting and receiving the packet.
In the case of BLE, a band of 2400MHz to 2483.5MHz is divided into 40 channels of 2MHz width and used. Of the 40 channels, 3 announcement channels (37, 38, and 39 channels) having intermediate frequencies (RF Center Frequency) of 2402, 2426, and 2480MHz are used for announcement. The other 37 Data communication channels (Data Channel Index is 0 to 36 channels) are used for Data communication after connection is established between the master and the slave.
Here, in conventional BLE-based wireless communication, the slave device always performs notification using the 3 channels. In contrast, in the radio communication system 1 according to embodiment 1, when a reconnection is attempted to a radio communication device 100 that has determined a role change from a slave to a master, the notification transmission unit 114 performs a notification using a predetermined one of the 3 channels, which is specified in the response of the role change confirmation unit 112 to the role change request. Further, which of the channels 37, 38, and 39 is to be used as the notification channel is set by the user in advance, for example.
In the wireless communication system 1 according to embodiment 1, as shown in fig. 4A, the notification transmitter 114 transmits the notification at a time interval I1 (e.g., 10 msec) shorter than the normal notification interval I0 (e.g., 1 sec) within a predetermined time T1 after the transmission of the notification is started. Then, after a predetermined time T1 has elapsed, the announcement is transmitted at a normal announcement interval I0. Here, the normal notification interval is an interval at which the radio communication apparatus 100 transmits a notification without changing the role.
When the role change confirming unit 112 determines that the role from the slave to the master is changed, the scanning unit 115 scans the announcement for 3 announcement channels.
Parameters that define the scanning operation performed by the scanning unit 115 include a scanning window (japanese: スキャン and ウィンドウ) and a scanning interval (japanese: スキャン and インターバル). The scanning window is an interval at which the scanning operation is actually performed. In addition, the scanning interval means an interval of adjacent scanning windows. When the scanning window and the scanning interval are equal, a continuous scanning operation is performed. The specification for BLE is that only one channel is scanned in each scan window, and it is recommended that each scan window scan a different channel, specifying that all 3 channels must be scanned. In embodiment 1, as shown in fig. 4A, the scanning unit 115 repeats scanning while sequentially changing the frequencies at 37, 38, 39, 37, 38, and 39 … … to the 3 announcement channels 37 to 39 at equal frequencies.
Next, a description will be given of a time until the notification transmitted by the notification transmission unit 114 of the wireless communication device 100 is received by the scanning unit 115 of another wireless communication device 100. Fig. 4A is a diagram showing the time transition of the scanning operation and the notification operation in embodiment 1. On the other hand, fig. 4B is a diagram showing a time transition of the conventional scanning operation and the notification operation. In both fig. 4A and 4B, the announcement is transmitted using a 38 channel. As shown in fig. 4B, in the conventional advertisement operation, the advertisement is transmitted at a normal advertisement interval I0, and at time tb, the transmitted advertisement is first scanned after the channel scanning starts at 38. In contrast, in fig. 4A, the announcement is transmitted at an announcement interval I1 shorter than I0 first, and at time ta earlier than time tb, the transmitted announcement is scanned first after the scanning of the 38 channels is started. That is, by transmitting the announcement at a high frequency only for a predetermined time T1 after the announcement starts, it is possible to realize a rapid announcement scan while suppressing power consumption as much as possible. In this manner, the scanner unit 115 functions as a receiver unit that receives the notification transmitted from the other wireless communication device 100.
When the role change confirmation unit 112 determines that the role from the master to the slave is changed and when the connection request is received from the other wireless communication device 100 for the notification transmitted by the notification transmission unit 114, the connection confirmation unit 116 establishes a connection in response to the connection request if the other wireless communication device 100 is already registered in the white list.
Further, when the role change confirmation unit 112 determines that the role of the slave is changed to the master and the scanning unit 115 receives a notification from another wireless communication apparatus 100 registered in the white list, the connection establishment unit 116 transmits a connection request of the other wireless communication apparatus 100 and establishes a connection.
After the connection with the other wireless communication apparatus 100 is established by the connection establishment unit 116, the data communication unit 117 performs data communication with the other wireless communication apparatus 100 based on the role identified by the role change confirmation unit 112, using 37 data communication channels.
Next, an example of the operation of the radio communication system 1 according to embodiment 1 will be described with reference to the timing chart of fig. 5. In the example shown in fig. 5, the operation of the master and the link layer of each of the wireless communication apparatuses 100a and 100b will be described in a case where the 1 st wireless communication apparatus 100a is a slave, the 2 nd wireless communication apparatus 100b is a master, and the roles of the wireless communication apparatuses are changed while the connection is established.
Since the 2 nd radio communication device 100b checks whether or not the role can be changed with the 1 st radio communication device 100a when the remaining battery capacity of the 2 nd radio communication device 100b is only slightly left, it transmits an inquiry (LL _ cause _ REQ) of a function supported by the link layer of the 1 st radio communication device 100a to the 1 st radio communication device 100a (step S10).
Then, the 1 st radio communication device 100a that has received the LL _ FEATURE _ REQ refers to FeatureSet indicating the link layer support function, and determines whether or not role switching is supported. If it is determined that the role change is supported, the 1 st wireless communication device 100a transmits a response (LL _ FEATURE _ RSP) supporting the role change to the 2 nd wireless communication device 100b (step S11).
Next, when the 2 nd wireless communication device 100b receives the response supporting role change from the 1 st wireless communication device 100a, the host of the 2 nd wireless communication device 100b outputs a role change instruction to the link layer (step S12). Then, the link layer of the 2 nd wireless communication device 100b transmits a ROLE change request (roll _ SWITCH _ REQ) to the 1 st wireless communication device 100a (step S13), and notifies the host of completion (step S14).
When receiving the role change request, the link layer of the 1 st wireless communication device 100a notifies the host computer of the reception of the role change request (step S15). Then, if the host determines that the battery remaining capacity of the 1 st wireless communication device 100a is sufficient and the role change to the host is possible, for example, the host instructs the link layer to perform a response that the role change is possible (step S16). Then, the link layer transmits information indicating an advertisement channel used for the advertisement at the time of reconnection and a ROLE-changeable response (roll _ SWITCH _ RSP) to the 2 nd wireless communication apparatus 100b (step S17), and notifies the host of completion (step S18).
When the link layer of the 2 nd wireless communication device 100b receives the response that the role change is possible from the 1 st wireless communication device 100a, the host of the 2 nd wireless communication device 100b instructs the link layer to read out the white list (step S19). Then, the link layer reads out data indicating the wireless communication apparatus 100 registered in the white list, and notifies the host of completion (step S20).
Next, the host of the 2 nd wireless communication apparatus 100b instructs the link layer to clear the read data of the white list (step S21). Then, the link layer notifies the host of completion when clearing the data (step S22).
Next, the host of the 2 nd wireless communication apparatus 100b instructs the link layer to add data indicating the 1 st wireless communication apparatus 100a to the white list (step S23). Then, when the link layer adds data indicating the 1 st wireless communication device 100a to the white list, the host is notified of completion (step S24).
The 1 st wireless communication device 100a also executes the same processing as steps S19 to S24 in steps S25 to S30.
Next, the host of the 2 nd wireless communication apparatus 100b instructs the link layer to disconnect the 1 st wireless communication apparatus 100a (step S31). Then, the link layer notifies the host of completion (step S33) after transmitting a disconnection request (TERMINATE _ IND) to the 1 st wireless communication device 100a (step S32).
When receiving the disconnection request, the link layer of the 1 st wireless communication device 100a notifies the host that the disconnection of the connection with the 2 nd wireless communication device 100b is completed (step S34).
Next, the host of the 2 nd wireless communication apparatus 100b instructs the link layer to set the data for notification (step S35), and when the link layer completes the setting of the data for notification, the host is notified of the completion (step S36).
Next, the host of the 2 nd wireless communication apparatus 100b instructs the link layer to set the parameters for notification (step S37), and when the link layer completes setting the parameters for notification, the host is notified of the completion (step S38).
Next, the host of the 2 nd wireless communication device 100b instructs the link layer start notification (step S39). After notifying the completion of the host (step S40), the link layer transmits the advertisement at an advertisement interval shorter than the normal advertisement interval (step S41).
The host of the 1 st wireless communication apparatus 100a instructs the link layer to set the parameters for scanning (step S42), and when the link layer completes setting the parameters for scanning, the host is notified of the completion (step S43).
Next, the host of the 1 st wireless communication apparatus 100a instructs the link layer to start scanning (step S44). After notifying the completion of the host (step S45), the link layer sequentially scans the 3 notification channels at predetermined time intervals.
When the link layer of the 1 st wireless communication device 100a determines that the notification is received from the 2 nd wireless communication device 100b registered in the white list, it notifies the host of the reception of the notification (step S46). When the host instructs the link layer to connect to the 2 nd wireless communication device 100b (step S47), the link layer returns the command status to the host (step S48).
Then, when receiving the notification from the 2 nd wireless communication device 100b, the link layer of the 1 st wireless communication device 100a transmits a connection request (CONNECT _ REQ) to the 2 nd wireless communication device 100b (step S49), and completes the establishment of a connection with the 2 nd wireless communication device 100b (step S50). After that, the 1 st wireless communication device 100a performs data communication with the 2 nd wireless communication device 100b as a host.
When the link layer of the 2 nd radio communication device 100b receives the connection request from the 1 st radio communication device 100a, the connection establishment with the 1 st radio communication device 100a is completed (step S51). After that, the 2 nd wireless communication device 100b is used as a slave and performs data communication with the 1 st wireless communication device 100 a.
Next, the operation of the radio communication apparatus 100 according to embodiment 1 will be described with reference to fig. 6 and 7. Fig. 6 is a flowchart showing an example of the role change process (a) executed by the control unit 101 of the wireless communication apparatus 100 according to embodiment 1. In the role change process (a), an example will be described in which the 2 nd wireless communication device 100b operating as a master changes to the role of a slave in a state where a connection with the 1 st wireless communication device 100a operating as a slave is established. The role change process (a) is executed by the control unit 101 of the 2 nd wireless communication apparatus 100 b.
The character change process (a) shown in fig. 6 is started when the character change receiving unit 111 determines that a character change request has been received, for example, because its battery remaining capacity is equal to or less than a predetermined value.
First, the role change confirmation unit 112 transmits an inquiry (LL _ cause _ REQ) of a function supported by the link layer of the 1 st wireless communication device 100a to the 1 st wireless communication device 100a (step S101). Then, the role change confirmation unit 112 determines whether or not a response (LL _ cause _ RSP) to the inquiry is received from the 1 st wireless communication device 100a (step S102). The character change confirmation unit 112 waits until the response is received (step S102; no).
When the role change confirmation unit 112 determines that the response to the inquiry (LL _ cause _ RSP) has been received from the 1 st wireless communication device 100a (step S102; yes), it determines whether or not the 1 st wireless communication device 100a supports role change based on the received response (step S103).
If it is determined that the 1 st wireless communication device 100a supports ROLE switching (step S103; yes), the ROLE switching confirmation unit 112 transmits a ROLE switching request (roll _ SWITCH _ REQ) to the 1 st wireless communication device 100a (step S104). Then, the character change confirmation unit 112 determines whether or not a response (roll _ SWITCH _ RSP) to the character change request is received from the 1 st wireless communication device 100a (step S105). The character change confirmation unit 112 waits until the response is received (step S105; no).
If the ROLE change confirmation unit 112 determines that the response (roll _ SWITCH _ RSP) to the ROLE change request has been received from the 1 st wireless communication device 100a (step S105; yes), it determines whether or not the 1 st wireless communication device 100a can perform the ROLE change based on the received response (step S106).
When it is determined that the 1 st wireless communication device 100a can perform role switching (step S106; yes), the role change confirmation unit 112 executes notification parameter setting processing for setting parameters for notification (step S107). Here, in the set notification parameter, the notification interval, which is the interval between notifications, is set to a value shorter than that of a normal notification. The response (roll _ SWITCH _ RSP) to the tone conversion request includes data indicating the channel for advertisement. The character change confirmation unit 112 registers the address of the 1 st wireless communication apparatus 100a in the white list.
Next, the connection disconnection unit 113 transmits a connection disconnection request (termination _ IND) to the 1 st radio communication device 100a (step S108). Then, the connection disconnection unit 113 disconnects the 1 st wireless communication device 100a from the connection.
Next, the notification transmitter 114 starts notification using the parameters set in step S107 and the notification channel notified in the response to the color conversion request (roll _ SWITCH _ RSP) (step S109).
The connection determiner 116 determines whether or not a connection request (CONNECT _ REQ) is received from the 1 st wireless communication device 100a registered in the white list (step S110).
When the connection establishment unit 116 determines that the connection request has been received from the 1 st wireless communication device 100a (step S110; yes), the notification transmission unit 114 stops the notification (step S111).
The connection establishing unit 116 executes a connection establishing process with the 1 st wireless communication apparatus 100a using the connection parameter included in the received connection request (step S112). Then, the connection establishing unit 116 terminates the role change process (a). After this processing is completed, the 2 nd wireless communication device 100b operates as a slave and performs data communication with the 1 st wireless communication device 100a operating as a master.
When the connection establishment unit 116 determines that the connection request has not been received from the 1 st wireless communication device 100a (step S110; no), the notification transmission unit 114 determines whether or not a predetermined time T1 has elapsed since the notification was started (step S113). If it is determined that the predetermined time T1 has not elapsed (step S113; no), the process returns to step S110.
When it is determined that the predetermined time T1 has elapsed (step S113; yes), the notification transmission unit 114 changes the notification interval to a normal value and continues the notification (step S114).
Then, the connection determiner 116 determines whether or not the connection request (CONNECT _ REQ) is received from the 1 st wireless communication device 100a registered in the white list (step S115).
When the connection establishment unit 116 determines that the connection request has been received from the 1 st wireless communication device 100a (step S115; yes), the process proceeds to step S111. In addition, when it is determined that the connection request has not been received from the 1 st wireless communication apparatus 100a (step S115; no), the advertisement transmitter 114 determines whether or not a predetermined time T2 (where T2 > T1) has elapsed since the start of the advertisement (step S116). If it is determined that the predetermined time T2 has not elapsed (step S116; no), the notification transmission unit 114 returns the process to step S115.
If the connection establishment unit 116 determines that the predetermined time T2 has elapsed (step S116; yes), it determines that the reconnection to the 1 st wireless communication device 100a has failed, and ends the role change process (a).
When the role change confirmation unit 112 determines that the 1 st wireless communication device 100a does not support role change (step S103; no), or when the 1 st wireless communication device 100a does not perform role change (step S106; no), the connection disconnection unit 113 disconnects the connection with the 1 st wireless communication device 100a (step S117), and ends the role change process (a).
Next, the role transformation process (b) executed by the control unit 101 of the radio communication apparatus 100 according to embodiment 1 shown as an example in fig. 7 will be described. In the role change process (b), an example will be described in which the 1 st wireless communication device 100a operating as a slave changes to the master role in a state in which a connection to the 2 nd wireless communication device 100b operating as a master is established. The role change process (b) is executed by the control unit 101 of the 1 st wireless communication apparatus 100 a.
The ROLE change processing (b) shown in fig. 7 is started when the ROLE change reception unit 111 receives a ROLE change request (roll _ SWITCH _ REQ) from, for example, the 2 nd wireless communication device 100 b.
First, the character change confirmation unit 112 determines whether or not the character change can be performed by itself (step S201). The character change confirmation unit 112 determines that the character change is possible, for example, when the battery remaining capacity of the unit is equal to or greater than a predetermined value.
When the ROLE change confirmation unit 112 determines that it is possible to change the ROLE (step S201; yes), it transmits a ROLE-change-possible response (roll _ SWITCH _ rsp (ok)) to the 2 nd wireless communication device 100b (step S202). The character change confirmation unit 112 includes data indicating the notification channel in the response.
Then, the character change confirmation unit 112 executes a scan parameter setting process for setting a parameter for scanning (step S203). The role change confirmation unit 112 registers the address of the 2 nd wireless communication apparatus 100b in the white list.
Then, the connection disconnection unit 113 determines whether or not a connection disconnection request (termination _ IND) is received from the 2 nd radio communication device 100b (step S204). The connection/disconnection unit 113 waits until receiving the connection/disconnection request (step S204; no).
When the connection disconnection unit 113 determines that the connection disconnection request is received from the 2 nd wireless communication device 100b (step S204; yes), the connection disconnection unit disconnects the connection with the 2 nd wireless communication device 100 a. Then, the scanner unit 115 starts scanning using the parameters set in step S203 (step S205).
The connection confirming unit 116 determines whether or not the notification is received from the 2 nd wireless communication apparatus 100b registered in the white list (step S206).
When the connection establishment unit 116 determines that the notification has been received from the 2 nd wireless communication device 100b (step S206; yes), the scanning unit 115 stops scanning (step S207).
Next, the connection establishing unit 116 transmits a connection request (CONNECT _ REQ) to the 2 nd wireless communication device 100b, and establishes a connection with the 2 nd wireless communication device 100b (step S208). Then, the character conversion process (b) is ended. After this processing is completed, the 1 st wireless communication device 100a operates as a master and performs data communication with the 2 nd wireless communication device 100b operating as a slave.
If it is determined that the 2 nd wireless communication device 100b has not received the notification (no in step S206), the scanner unit 115 determines whether or not a predetermined time T2 has elapsed since the start of scanning (step S209). If it is determined that the predetermined time T2 has not elapsed (step S209; no), the scanner unit 115 returns the process to step S206.
When the scanner unit 115 determines that the predetermined time T2 has elapsed (step S209; yes), the scanning is stopped (step S210). Then, the connection establishing unit 116 determines that reconnection with the 2 nd wireless communication apparatus 100b has failed, and ends the role change process (b).
If it is determined that the 1 st wireless communication device 100a cannot perform the ROLE change (step S201; no), the ROLE change confirmation unit 112 transmits a response (roll _ SWITCH _ rsp (no)) indicating that the ROLE change cannot be performed to the 2 nd wireless communication device 100b (step S211). Then, the character change confirmation unit 112 ends the character change process (b).
As described above, in the radio communication apparatus 100 according to embodiment 1, the notification channel is previously assigned in a state where the connection is established, and when the radio communication apparatus 100 transmits the notification, the radio communication apparatus 100 transmits the notification using the notification channel. In this case, since the announcement is transmitted at a shorter interval than usual, reconnection can be performed quickly.
Further, since the wireless communication apparatuses 100 having established connection disconnect in synchronization with each other and then perform notification or scanning, reconnection can be performed smoothly.
The wireless communication apparatus 100 that operates as a slave after the role change accepts only connection requests from the wireless communication apparatuses 100 registered in the white list. The wireless communication device 100 that operates as the master after the role change accepts only the notification from the wireless communication device 100 registered in the white list. Therefore, it is possible to prevent connection with a wireless communication device other than the role switching partner after disconnection.
(embodiment mode 2)
In embodiment 1, after the role change, the wireless communication apparatus 100 operating as a slave transmits a notification at a short interval after the disconnection, thereby realizing smooth reconnection. However, the method of smoothly performing reconnection is not limited to this. In embodiment 2, an example of a scanning method of the wireless communication apparatus 100 that operates as a master after a role change is described as follows: in the first scanning period after the start of scanning, the announcement channel, which is previously agreed with the other radio communication apparatuses 100, is scanned for a longer time than the normal scanning window, and then, the 3 announcement channels are sequentially scanned using the normal scanning window.
Fig. 8 shows the time transition of the scanning operation and the notification operation in embodiment 2. In fig. 8, the notification is transmitted using a 38 channel at a normal notification interval I0. As shown in fig. 8, after the start of scanning, the scanning unit 115 of the wireless communication device 100 scans 38 channels, which are notification channels previously agreed with another wireless communication device 100 as a role switching partner, during the first scanning period. The scanning window S1 (e.g., 10.24 seconds) at this time is longer than the normal scanning window S0 (e.g., 1 second). Here, the normal scan window refers to a scan window in a case where no role change is performed. After the scanning of the 38 channels is completed, the scanning unit 115 sequentially scans the 3 notification channels using the normal scanning window S0. In this way, in the first scanning period after the disconnection, scanning is performed on the previously scheduled announcement channel for a longer time than the normal scanning window, and thus, scanning of the announcement can be performed quickly.
(embodiment mode 3)
Next, as embodiment 3, another example of the scanning method of the wireless communication apparatus 100 that operates as a master after the role change will be described.
Fig. 9 shows the time transition of the scanning operation and the notification operation in embodiment 3. In fig. 9, the notification is transmitted using a 38 channel at a normal notification interval I0. As shown in fig. 9, the scanning unit 115 of the wireless communication device 100 starts scanning, and then sequentially scans the 3 announcement channels using a scanning window S2 (for example, 25 milliseconds) shorter than the normal scanning window S0. By shortening the scanning window in this manner, even if the channel through which the announcement is transmitted from the wireless communication apparatus 100 as the role changing partner is unclear, the announcement can be scanned quickly.
(embodiment mode 4)
Next, as embodiment 4, another example of the scanning method of the wireless communication apparatus 100 that operates as a master after the role change will be described.
Fig. 10 shows the time transition of the scanning operation and the notification operation in embodiment 4. In fig. 10, the advertisement is transmitted in a 38 channel at a normal advertisement interval I0. As shown in fig. 10, the scanning unit 115 of the radio communication apparatus 100 scans 3 announcement channels not sequentially at equal frequencies, but at 38 frequencies, which is an announcement channel previously agreed between the high-frequency scanning and another radio communication apparatus 100 as a role switching partner. That is, in the example shown in fig. 10, the channels are scanned 38 at a rate of once in each scanning window twice. In this manner, by setting the scanning order so as to scan the announcement channel that is previously agreed between the wireless communication device 100 as the role changing partner and the other wireless communication device 100 as the role changing partner at a high frequency, the announcement transmitted from the wireless communication device 100 as the role changing partner can be quickly scanned.
(embodiment 5)
In the case of normal BLE-based wireless communication, the wireless communication device performs connection processing using connection parameters included in a packet of a connection request (CONNECT _ REQ). However, the wireless communication apparatus 100 may continue to use the connection parameters used in the case of the connection before the role change at the time of the reconnection after the role change.
Specifically, the connection parameters included in the packet of the connection request include AA, CRCInit, WinSize, WinOffset, Interval, Latency, Timeout, ChM, Hop, and SCA.
AA is the read-write address of the concatenated data packet. The value of AA can continue to be used provided that it is not overwritten by other connected AA. Further, the present invention can be used continuously even when setting of another connection is not permitted during a period from disconnection to reconnection.
CRCInit is a value of an initial value of a shift register that specifies a checksum of the check packet. The value of CRCInit is randomly generated by the link layer and therefore cannot be used further when reconnected.
WinSize indicates the period during which the data array can be transmitted first. The value of WinSize can be used continuously.
WinOffset indicates an offset time until the start of the next window size after the connection request is transmitted. In a case where the wireless communication apparatus 100 is not busy by another operation after the connection request is transmitted/received, the value of WinOffset can be continuously used.
Interval indicates the period of channel change. The value of Interval can continue to be used.
Latency indicates that the number of connection events can be ignored when there is nothing to transmit from the wireless communication apparatus 100 operating as a slave to the wireless communication apparatus 100 operating as a master. The value of Latency can be used further.
Timeout is the time at which a connection is determined to be lost. The value of Timeout can continue to be used.
ChM is a value that specifies what data channel to use at a connection event. ChM can continue to be used.
Hop is a value that specifies the switching order of the data channels. The value of Hop can be used continuously.
The SCA is a value indicating the accuracy of the sleep clock of the wireless communication apparatus 100 operating as a master. If the clock accuracy is the same between the wireless communication device 100 operating as the master and the wireless communication device 100 operating as the slave, the value of the SCA can be continuously used.
Therefore, among the connection parameters used in the connection before the role change, the parameters that can be continuously used even after the disconnection may be held, and the connection establishment unit 116 of the wireless communication apparatus 100 that operates as the master after the role change may transmit a connection request including the connection parameters that cannot be continuously used and omitting the connection parameters that can be continuously used when attempting reconnection with the wireless communication apparatus 100 that is the role change partner. In this way, a simplified connection request in which connection parameters that can be used continuously are omitted is transmitted, and power saving can be achieved at the time of reception processing or at the time of packet processing of the wireless communication apparatus 100 that has received the connection request.
The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments.
For example, in the above-described embodiment, an example has been described in which information indicating a channel for notification when reconnection is attempted after disconnection is included in a response to a color conversion request. However, the method of notifying the notification channel at the time of reconnection is not limited to this, and the notification channel at the time of reconnection may be determined by what method the wireless communication device 100 operating as the slave unit has established before disconnection. For example, when the wireless communication apparatus 100 operating as the master transmits a role change request, information indicating a notification channel at the time of reconnection may be included in the packet.
In the above-described embodiment, the example in which the wireless communication device 100 operating as the master transmits the role change request has been described, but the wireless communication device 100 operating as the slave may transmit the role change request.
In the above-described embodiment, an example has been described in which a character conversion partner is registered in a white list in order to be reliably reconnected to the character conversion partner. However, instead of using the white list, the notification transmitter 114 of the wireless communication device 100 that operates as a slave after the role change may designate a DIRECT notification (ADV _ DIRECT _ IND) of the wireless communication device 100 of the role change partner as the partner of the notification when transmitting the notification. Since the address of the other party is acquired from the notified information during the connection period before the role change, the address is directly notified, and connection with a wireless communication apparatus other than the role change partner can be prevented.
The transmission method of the announcement described in embodiment 1 and the scanning methods described in embodiments 2 to 4 may be combined with each other. For example, the notification transmitter 114 of the wireless communication device 100 that operates as a slave after the role change may transmit the notification on the 38 channel at the notification interval I1 until the predetermined time T1 elapses after the notification is started, and the scanner 115 of the wireless communication device 100 that operates as a master after the role change may scan the 38 channel in the scanning window S1 during the first scanning operation.
In the above-described embodiments, although the example of the wireless communication system that performs wireless communication using BLE has been described as an example of the wireless communication standard, the wireless communication standard to which the present invention can be applied is not limited to BLE, and the present invention can be applied to communication between devices operating as a master and a slave under other standards.
The wireless communication device 100 of the present invention is not limited to a dedicated device, and can be realized by using a general computer system. For example, the functions of the wireless communication apparatus 100 may be realized by executing a program by a computer. The program for realizing the functions of the wireless communication apparatus 100 may be stored in a computer-readable storage medium such as a USB (Universal Serial Bus) memory, an SD (Secure Digital) memory card, a CD-rom (compact Disc Read only memory), a dvd (Digital Versatile Disc), a BD (Blu-ray (registered trademark) Disc), an HDD (Hard disk drive), or the like, or may be downloaded to a computer via a network.
Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these particular embodiments, and the present invention includes the scope of the claims and their equivalents.
The present application claims that all contents of this basic application are introduced based on the priority of japanese patent application No. 2014-134138 filed on 30/6/2014.

Claims (9)

1. A wireless communication apparatus for performing wireless communication based on a role of a master or a slave,
the wireless communication apparatus includes:
a role change reception unit that receives a role change request from the slave to the master in a state where the role of the wireless communication device is the slave and a connection to another wireless communication device that operates as the master is established; and
a reception unit that waits for the identification information transmitted from the other wireless communication device by receiving in a predetermined pattern on a plurality of channels including a predetermined channel when the role change reception unit receives the change request,
the receiving unit receives the plurality of channels in the predetermined pattern as follows: the time or the number of times of waiting for the identification information on the predetermined channel is longer or more than a predetermined comparison criterion when the character change reception unit does not receive the change request.
2. The wireless communication apparatus of claim 1,
the receiving unit receives the predetermined channels sequentially in 2 nd predetermined time shorter than the 1 st predetermined time after receiving the predetermined channels from the start of reception until the 1 st predetermined time elapses.
3. The wireless communication apparatus of claim 1,
the receiving unit sequentially receives the plurality of channels in a time shorter than the predetermined comparison criterion.
4. The wireless communication apparatus of claim 1,
the receiving unit alternately receives the predetermined channel and a channel other than the predetermined channel among the plurality of channels.
5. The wireless communication apparatus of claim 1,
the wireless communication device further includes a role change confirmation unit that inquires of the other wireless communication device whether the role change from the master to the slave is possible when the role change request is received by the role change reception unit,
when the response to the inquiry from the character change confirmation unit by the other wireless communication device indicates that the character change is possible, the reception unit waits for the identification information transmitted by the other wireless communication device.
6. The wireless communication apparatus of claim 1,
the role change receiving unit receives the change request from the other wireless communication device.
7. The wireless communication apparatus of claim 1,
the wireless communication apparatus further includes a connection establishment unit that transmits a connection request to the other wireless communication apparatus that has transmitted the identification information received by the reception unit, and establishes a connection with the other wireless communication apparatus,
the role change reception unit records device information of the other wireless communication device in a storage device when receiving the change request,
when the identification information is received from another wireless communication apparatus and the apparatus information of the other wireless communication apparatus that transmitted the connection request is recorded in the storage apparatus, the connection confirmation unit transmits the connection request to the other wireless communication apparatus that transmitted the identification information.
8. The wireless communication apparatus of claim 7,
the connection establishing unit continues to use the connection parameter used for the connection before the role change as the connection parameter after the role change.
9. A wireless communication method executed by a wireless communication apparatus that performs wireless communication based on a role of a master or a slave,
the wireless communication method includes:
a role change reception step of receiving a role change request from the slave to the master in a state where the role of the wireless communication device is the slave and a connection is established with another wireless communication device that operates as the master; and
a reception step of waiting for the identification information transmitted from the other wireless communication apparatus by receiving in a predetermined pattern on a plurality of channels including a predetermined channel when the role change reception step has received the change request,
in the receiving step, receiving is performed on the plurality of channels in the predetermined pattern as follows: the time or the number of times of waiting for the identification information on the predetermined channel is longer or more than a predetermined comparison criterion when the character change reception step does not receive the change request.
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US20180349959A1 (en) 2018-12-06
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US10475080B2 (en) 2019-11-12

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